Double lift inclosed drive gear jack



May 23; 1933- J. A. ADELL DOUBLE LIFT INCLOSED DRIVE GEAR JACK Filed Feb. 10 1930 Patented May 23, 1933 UNITED STATES JOHN A. ADELL, OF ORANGE, MASSACHUSETTS DOUBLE LIFT INGLOSED DRIVE GEAR JACK Application filed February 10, 1930. Serial No. 427,191.

This invention relates to a jack for general use but particularly designed for lifting automobiles and the like.

The principal objects of the invention are to provide a double lift jack capable of being constructed at very low cost; to provide improved means whereby the operating handle will be connected directly to lift a non-rotatable internal screw and at the same time lift itself by the rotation of a combined nut and gear, or the like, so as to provide two movable lifting members with a minimum number of parts; to provide a construction in which the upper part, in- =r5 volving the internal screw, will be stabilized by a second casing element which rises as the handle is turned and provides for the raising of the internal screw or rack with res ect to itself.

' ther objects and advantages of the invention will appear hereinafter.

Reference is to: be had to the accompanying drawing, in which Fig. 1 is a diametrical sectional view of a jack constructed in accordance with this invention shown in its lowest position;

Fig. 2 is a sectional view of the same on the line .22 of Fig. 1 somewhat enlarged;

Fig. 3 is a bottom plan of the jack;

Fig. 4 is a sectional view like Fig. 1 except that the jack is raised practically to its limiting position;

Fig. 5 is a front elevation of the same, and

Fig. 6 is a-sectional view on the line 6-6 of Fig. 4.

The jack is shown as constructed with a base 10 having a casing 11 fixed securely or integrally thereto and extending up prac- 4o tically to the limiting height of the jack when in lowermost position. This casing has a slot 12 extending down, preferably on the front side, for a purpose to be described. Within the casing, but separated from it, is an internal casing 13 extending internal screw 25.

up about to the bottom of the slot 12 and fixed to the base 10. At "the top it is provided with an integral nut 14 for a lifting screw or screw member 15. This screw turns up out of the nut by rotation.

The handle 9 is shown with the non-cir- 'cu'lar end entering a similar socket in a gear 16. This gear has bearings in a cylindrical pressed metal bearing 17 which has ears 22 forced through holes in a casing 18 and headed over to hold the bearing 17. The casing 18 is arranged to fit and to slide up and down in the interior of the casing 11. It is to receive this projection 17 that the slot 12 is provided. The casings 11, 13 and 18 preferably are formed of fiat stock formed into cylindrical shape. This is much less expensive than tubular stock. The ears 22 are located on opposite sides of the seam in the casing 18. These seams can be spot welded if desired. The gear 16 is shown as of bevel form and can be stamped out of metal in a very inexpensive manner. It meshes with a bevel gear 19 forming the lower partof a threaded plug 20 to which is fixed the top of the 16 constitute means for holding the plug 20 in a definite position in the casing 18 and the bevel gear 19 in close contact with the bevel gear 16. Sliding in the casing -or member 18 is an The screw-threads in this screw fit the screw-threads on the plug '20. This internal screw is open along one 5 side to allow it to pass down over the flange 21. It is made a little more than a half circle and projects inwardly at the edges as'shown at 26 so that the plug will not come out of the screw and it will have enough contact with it around more than a half circle to avoid the swinging of this hollow member 25. It is also prevented from swinging at the point where the plug engages it by the fact that the plug is always at the top of the sliding member or casing 18 which is a closed figure. At the top of the internal screw 25 it is provided with a rest 27 for the article to be lifted. The three members 11, 18 and 25 constitute a telescoping construction.

Although not essential, I have shown the whole device as substantially D shaped in cross section as appears most fully in the sectional views Figs. 2 and 6; that is, one side is flat and the opposite side is semicircular and these sides are connected by fiat portions.

This makes a very strong construction involving no parts which are very expensive to make. As stated the gear 16, bearing 17, plug 20 and the internal screw 25 can be made by pressing operations, not requiring machine finish afterward, so that practically the only finish required is the threading of the screw 15 and the nut 14. It is also very simple to assemble and the time involved in putting the parts together is comparatively short. The threads of the plug 20 and internal screw 25 are arranged preferably as shown. The external thread on the plug 20 has a square shoulder along the top and the internal thread one on the bottom. So the latter rests on the former on a fiat surface instead of an inclined one. Thus there is less tendency to spread the internally threaded member. The screw 20 is of twice the pitch of the screw 15 as shown but of course is not limited to that proportion.

In operation, the parts being assembled in the position shown in Fig. 1, the turning of the handle in one direction will rotate the lug 20 and simultaneously rotate the screw 15 to lift the plug and the sliding part of the casing 18 and also move the non-rotatable hollow screw 25 upwardly independently. In this way, throughout the operation of the jack in either direction, both motions of translation are operating simultaneously, so that the support for the screw 25 is moving upwardly at the same rate at which the screw 25 is moving upwardly with respect to that support and the same is true of the downward motion. It will be seen that the casing 11 holds the sliding member 18 against moving over to one slde and that when at the limit of upward motion, as shown in Fig. 4, there is still a large contact of their surfaces to keep this member 18 in proper alignment. Furthermore, the nut 14, which is fixed, holds the screw 15 against swinging to one side and thus the plug 20 is independently stabilized. This plug is also fixed with respect to the sliding member 18 by the flange 21. In addition to this, the top member 25 is held in proper position by the plug 20 inside it and by the casing 18 outside.

It will be seen therefore that a double lift is secured; that it is a gear jack, thus reducing the strain on the parts and getting as high efficiency as can be secured in a jack of this type. Also every rotation of the handle produces a double lift of the top of the jack. The parts are of such a nature that they can be manufactured cheaply and replaced readily if'n'ecessary.

Although I have illustrated and described only one form of the invention, I am aware of the fact that modifications can be made therein by any person skilled in the art with out departing from the scope of the invention as expressed in the claims. Therefore, I do not wish to be limited to all the details of construction herein shown and described, but what I do claim is 1. In a jack, the combination with three telescoping members, the outside one being at the bottom and constituting a casing, the inside one being at the top and constituting a work support and having an internal thread extending around more than half a circle and being open on one side, of a threaded plug meshing with said internal threads and having a screw fixed to it and extending downwardly from it, means for rotating the plug extending through said open side, and a nut supported by and located near the upper part of the casing member fitting said screw.

2. In a jack, the combination with three telecsoping members, the outside one being at the bottom and constituting a casing, the inside one being at the top and constituting a work support and having an internal thread extending around more than half a circle and being open on one side and means extending through said open side for operating the jack, of a threaded plug meshing with said internal threads and having means extending downwardly from it in screw threaded relationship with the outer member for raising and lowering the plug when it is turned so that the plug will move and the internally threaded member will move faster in the same direction.

8. In a jack, the combination with three telecsoping members, the outside one being at the bottom and constituting a casing, the inside one being at the top and constituting a work support and having an internal thread extending around more than half a circle and being open on one side, of a threaded plug meshing with said internal threads and having threaded means extending downwardly from it comprising a. fixed nut receiving the threaded means for raising and lowering the plug when it is turned so that the plug will move and the internally threaded member will move faster in the same direction, the plug having gear teeth on the end, a hearing fixed to the intermediate telescoping member, a pinion in the 5 bearing and engaging the gear teeth and a flange projecting inwardly to hold the plug in Contact with the pinion.

In testimony whereof I have hereunto affixed my signature.

JOHN A. ADELL. 

